body {
  font-family: "Lato", sans-serif;
}
.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: lightslategray;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}
.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #070707;
  display: block;
  transition: 0.3s;
}
.sidenav a:hover, .offcanvas a:focus{
  color: oldlace;
}
.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}
#main {
  transition: margin-left .5s;
  padding: 16px;
}
@media screen and (max-height: 450px) {
.sidenav {padding-top: 15px;}
.sidenav a {font-size: 18px;}
}
body {font-family: "Lato", sans-serif;}
#teach
{
	width: 1340px;
  background:red;
	animation:mymove 5s infinite;
	-webkit-animation:mymove 5s infinite;
}
@keyframes mymove
{
	from {background-color:papayawhip;}
	to {background-color:palegreen;}
}
div.tab {
    overflow: hidden;
}
div.tab button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: 0.3s;
    font-size: 17px;
}
div.tab button:hover {
    background-color: rgb(190, 229, 235);
}
div.tab button.active {
    background-color: rgb(199, 240, 224);
}
.tabcontent {
    display: none;
    padding: 6px 12px;
    -webkit-animation: fadeEffect 1s;
    animation: fadeEffect 1s;
}
@-webkit-keyframes fadeEffect {
    from {opacity: 0;}
    to {opacity: 1;}
}
@keyframes fadeEffect {
    from {opacity: 0;}
    to {opacity: 1;}
}
body {
  font-family: Verdana, sans-serif;
  margin: 0;
}
* {
  box-sizing: border-box;
}
.row > .column {
  padding: 0 8px;
}
.row:after {
  content: "";
  display: table;
  clear: both;
}
.column {
  float: left;
  width: 25%;
}
.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: black;
}
.modal-content {
  position: relative;
  background-color: #fefefe;
  margin: auto;
  padding: 0;
  width: 90%;
  max-width: 1200px;
}
.close {
  color: white;
  position: absolute;
  top: 10px;
  right: 25px;
  font-size: 35px;
  font-weight: bold;
}
.close:hover,
.close:focus {
  color: #999;
  text-decoration: none;
  cursor: pointer;
}
.cursor {
  cursor: pointer
}
.prev,
.next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -50px;
  color: white;
  font-weight: bold;
  font-size: 20px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
  -webkit-user-select: none;
}
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}
.prev:hover,
.next:hover {
  background-color: rgba(0, 0, 0, 0.8);
}
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}
img {
  margin-bottom: -4px;
}
.caption-container {
  text-align: center;
  background-color: black;
  padding: 2px 16px;
  color: white;
}
.demo {
  opacity: 0.6;
}
.active,
.demo:hover {
  opacity: 1;
}
img.hover-shadow {
  transition: 0.3s
}
.hover-shadow:hover {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19)
}